Why are my shadows suddenly low quality on a translucent material?

The two images are changes over night without me doing anything to edit the material or the lighting. I have no idea what could have changed and I can’t figure out how to get it back to how it was before. The water is a translucent material. I’ve tried increasing light samples, disabling virtual shadow maps, and enabling forwardshading in my translucent material. Forward shading helped a bit, but this part of my project hasn’t changed in months and suddenly it broke without me touching it. Any help would be much appreciated!